A number field extension of Ramanujan's identity and its integral representation via the generalized Riemann $Ξ$-function

Abstract: On pages 219--220 of Ramanujan's Lost Notebook appears an intriguing modular transformation whose integral representation is expressed in terms of the Riemann $Ξ$-function. In this paper, we establish a number field analogue of this identity. We also obtain an integral representation for the transformation formula associated with the functional equation of the higher power of the Dedekind zeta function recently studied by the present author and Maji. Interestingly, we recover Hardy's integral representation of the well-known Jacobi theta relation involving the Riemann $Ξ$-function. We further obtain a number-field analogue of the extended Ramanujan--Koshliakov formula established by Dixit.